A sports shop had 400 ping pong balls for sale. Each ping pong ball is sold at $3. At the end of each day, the number of ping pong balls sold was recorded in the bar graph shown.
- What fraction of the total number of ping pong balls was left at the end of Day 4? Express your answer in its simplest form.
- If the shop decided to sell every 4 ping pong balls at $8 from Day 5 onwards, how much less would it collect from the sale of the ping pong balls?
(a)
Number of ping pong balls left at the end of Day 4
= 400 - 60 - 80 - 68 - 44
= 148
Fraction of ping pong balls left at the end of Day 4
=
148400=
37100 (b)
Number of ping pong balls sold from Day 5 to Day 6
= 76 + 60
= 136
Amount that it would collect if it sold the 136 ping pong balls at the original price
= 136 x 3
= $408
Number of sets of 4 ping pong balls
= 136 ÷ 4
= 34
Amount that it would collect if it sold the 136 ping pong balls at every 4 ping pong balls at $8
= 34 x 8
= $272
Amount that it would collect less from the sale of the ping pong balls
= 408 - 272
= $136
Answer(s): (a)
37100; (b) $136